[TabManager] Fix discard only once regression.

chrome/browser/memory/tab_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/memory/tab_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 152 matching lines @@
 #if defined(OS_WIN) || defined(OS_MACOSX)
   // If the feature is not enabled, do nothing.
   if (!base::FeatureList::IsEnabled(features::kAutomaticTabDiscarding))
     return;
 
   // Check the variation parameter to see if a tab be discarded more than once.
   // Default is to only discard once per tab.
   std::string allow_multiple_discards = variations::GetVariationParamValue(
       features::kAutomaticTabDiscarding.name, "AllowMultipleDiscards");
   if (allow_multiple_discards == "true")
+    discard_once_ = false;
+  else
     discard_once_ = true;
-  else
-    discard_once_ = false;
 
   // Check the variation parameter to see if a tab is to be protected for an
   // amount of time after being backgrounded. The value is in seconds.
   std::string minimum_protection_time_string =
       variations::GetVariationParamValue(features::kAutomaticTabDiscarding.name,
                                          "MinimumProtectionTime");
   if (!minimum_protection_time_string.empty()) {
     unsigned int minimum_protection_time_seconds = 0;
     if (base::StringToUint(minimum_protection_time_string,
                            &minimum_protection_time_seconds)) {
@@ skipping 692 matching lines @@
     }
   } else {
     // The code here can only be tested under a full browser test.
     AddTabStats(&stats_list);
   }
 
   return stats_list;
 }
 
 }  // namespace memory